Steam-engine



(No Model.) 4 SheetsSheet 1.

T J. T. CASE.

STEAM ENGINE,

No. 394,911. PatentedDeo. 18, 1888.

IMF/725555. hfemm'.

4 Sheets-Sheet 3..

(No Model.)

J. T. CASE.

STEAM ENGINE.

No. 394,911. Patented Dec. 18, 1888.

awn/2%.

(N0 ModeL) 4 Sheets-Sheet 4. J. T. CASE...

STEAM ENGINE.

N. PETERS. Pbhln-Lithogngher. Wnhingiw QC.

a front elevation of my engine.

PATENT TFTcE.

JOEL T. CASE, OF BRISTOL, CONNECTICUT.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 394,911, dated December 18, 1888.

Application tiled February 18, 1888. Serial No. 204,463. (N0 model.)

To aZZ whom it may concern lle it known that I, .IOEL T. (List), a citizen of the United States, residing at Bristol, in the county of l'lartt'ord and State of Connecticut, have invented certain new and useful Improvements in Steain-I lngines, of which the following is a specification.

My invention relates to improvements in steam-engi nes; and the objects of my improvement are to simplify the construction, and, in general, to increase the efficiency of the engine.

In the accompanying drawings, Figure l is .Fig. 2 is a vertical section, partly in elevation, on line .11 .1': of Fig. 23. Fig. S3 is a vertical section, partly in elevation, on line 1 2 of Fig. 2. Fig.4 is a sectional. plan view of the case on line 2 z of Fig. 2. Fig. 5 is a partial section of the cylinder on line azc ot' ltig. 3; and Fig. 6 is a side elevation of the cylinder, showing a modification in the t'orm of the balancing-chamber.

A designates the case or frame, the lower part of which is provided with bearings a a for the crank-shaft ll, and also with detachable caps 1) I), that cover holes through which access may be had to the interior of the lower part of said case. The upper part of the case is provided with two longitudinal side chambers, c c, to which pipes may be connected at the hubs r] d for the admission and discharge of steam. llctween these side chambers there is an upper chamber havin a trough-shaped cylinderseat semicircular in cross-section, and within which I arrange the cylinders C, said cylinders being smni-cylimlrical at their lower ends, which ends are titted to the cylinder-seat, as shown in Figs. 2 and 3. This cylinder-seat, ot' a semicircular form in crosssection, is easily turned out or finished by means of a boring-bar insertedthrough holes in the ends of the case, which holes are afterward tilled by plugs e. Steam-ports f f are fO'llllQtl in the case leading from the longitudinal side chambers, c c, to the cylinderseat of the upper chamber, and the semi-cy lindrical ends of the cylinders are provided with ports 9 atpoints which traverse over the ports ff during the oscillating movement of the cylinders. Within each cylinder I place a piston, I), Fig. 2, the same being connected by a piston-rod, 71, to the cranks i of the shaft ll. The cylindcmseat is slotted, as shown, in order to allow the necessary swinging movement of the piston-rods. Ipreler to attach to each cylinder asleeve, 7;, through which the pistod-rod extends, and in the end of which may be arranged a stulting-box, to make a tight joint.

.In order to prevent the rounded ends of the cylinders from being forced to their seat with such pressure as to cause a great friction thereon, I form between the confronting faces of the cylinder end and its seat a chamber or chambers, in, which chambers I conncctby means of openings with the interior of the cylinders, so that steam may enter the bal ancing-chaml)ers m, and thereby relieve the working-faces of the cylinder end and its seat from undue pressure. As shown in Figs. 3 and 5, these balancing-chambers are arranged upon each side of the port g and connected with the interior of the cylinder by means of perforations. In Fig. (1 l have shown said balancing-chaniber as extending nearly the whole width of the cylinder end and running into the port g, so that said chamber connnunicates with the interior of the cylinder through said ports g. So long as the cylinder end at the upper side of the port .tits the cylinder-seat the action of the cylinder and its ports with the cylinder-scat and the ports is not changed.

Live steam is admitted to either one of the longitudinal side chambers, c c, as may be desired, in which case the chamber on that side is the live-steam chamber and that on the op posite side is the exhalist-chamber. Fig. 2 represents the cylimler in the central point of its throw, and consequently the ports on both sides are closed. As the crankshaft revolves so as to open the ports of the live-steam chamber, the steam is admitted into the lower end of the cylinder,thereby 't'tn'cing the piston upwardly the length of its stroke. As the cylinder is rocked by the motion of the crankshaft, the ports on the live-steam side are closed and those on the exhaust side opened,

so that the steam is discharged during the return-stroke of the piston.

The engine may be worked with only one cylinder but inasmuch as the piston is forced in one direction only I prefer to employ two cylinders and pistons, as shown, so that while one is driven upward under steam-pressnre theother eylind er may be dist'eharging steam and the piston mak ing its return-stroke. The number ot' pistons and eylinr'lers ean be in ereased to three or more by simply making the engine longer.

Some of theadvantages ol my invtmtion are as follows: The eylimlers are wholly supported on the roumled seats, upon which they oseillate, and are thus attordml an extendm'l bearing-surtfaee, whieh prevents any uneven wear or undue 't'rietion ot' the parts. i nrther, the ports in the rounded end of the eylinde' and its seat are so loeat ed that an unln'oken and eontinnons steam-tight joint is lknrmed at the opening provided for the piston rod and sleeve, whereby said opening is rendered thm-oughly steam-tight without the employment of paeking or stalling boxes for such purpose, and, t'nrther, the eylinder is steambalaneed on its rounded seat and the wear of the eylinder-bearing and its seat is redneed to the minimum.

I elaim as my inventionl. In an engine, the (:(jnnbinat ion, with a easing or trame provided with a rounded seat, ot' a eylimler eonstrueted with a rounded end whieh is titted to and SillJlHHl'Oll by the rounded seat, said rounded eylinder end and seat having ports for the admission and exhaust of steam, the ports in the seat and eylinder being relatively arranged to insure the regulation oi the admission and exhaust of steam by the oseillatory movemen t of the cylinder on its seat, and also to form a steam-tight. joint between the eylinder-bearing and its seat at and around the opening providerjl tor the fiston-rod and sleeve, and suitaliile steam chambers or passages formed between the extended stez'un-tight joint-lmariugs on opposite sides of the o 'iening in the easing lor lmlaneing the cylinder and relieving its bearing and seat of undue pressure and wear, substantia'llly as Set forth.

In an engine, the eonibination ot' the ease or frame havinga cylinder-seat and ports formed in the walls of said seat, the cylinder having'a rounded end fitted to and supported by said seat, and also having ports formed in said rounded end, a balaneing-ehamber, in, formed between the rounded end of said eylinder and its seat and eoini'nunieating with the interior of said (-ylinder, a piston and piston-rod, and erank to whieh said rod is eonneetet'l, substantially as deseribed, and for the purpose specified.

t. In an engine, the eoinbination,with aease or'ii'rame provided with an elongated rounded seat, of two eylimlers, eaeh emistrueted with a rounded end wh ieh is fitted to and supported by the elongated rounded seat, said rounded eylimler ends and eltnlgated rounded settbeing provided with ports for the admit, 1011 of 1 9am to and its exhaust from eat-h of said eylimlers, substantially as set toi-th.

t. In an engine, the combination, with a case or frame provided with two rounded seats, each provided with an openin tor the passage of a piston-rod and sleeve, of two eylil'nlers, each being open at one end and at. its opposite end Formed with a rounded end which is titted to and supportet'l by one of the rounded seats, said rounded ey] inder ends and rounded seats being provided with ports for the ad mission and exhaust ot' steam, and pistons, piston rods, and sleeves l'or tmnsmitting power to a erank-shal't, substantially set forth.

In an migine, the eombinatitni, with at ease or frame provided with a rounded seat having an opening; for the passage of the pistonrod and sleeve, and a cylinder titted to and su iiported by said rounded seat, oi a sleeve seeured to the cylinder, a piston-rod extending through the sleeve, and a stuffing-box on the sleeve for paek i ng' the piston-rod, substantially as set forth.

JOEL '1, CASE.

\Vitmesses:

JAMES since-tin), JOHN EDWARDS, J 1:. 

